Supplemental Cash Flow Information - Supplemental Information About Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for interest	$ 75,684	$ 86,314
Cash paid during the period for income taxes, net of refunds of $3,703 and $939	23,939	63,727
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING ACTIVITIES:
Accrued obligations for the purchase of property and equipment	(4,849)	(13,628)
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES:
Accrued dividends	854	602
Accrued deferred financing costs	$ 1,079	$ 0